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Finding the Fourth Proportional to 915.02, 1,262.39 and 521.81

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Solution

The fourth proportional to 915.02, 1,262.39 and 521.81 is: 719.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.02 : 1,262.39 = 521.81 : x
  2. Step 2: Convert to fraction form
    915.02/1,262.39 = 521.81/x
  3. Step 3: Cross multiply
    915.02x = 1,262.39 × 521.81
  4. Step 4: Simplify right side
    915.02x = 658,727.73
  5. Step 5: Solve for x
    x = 658,727.73/915.02
  6. Step 6: Final answer
    x = 719.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.